General Contractor Classifications (Abbrev.)
- Asphalt Paving (AP)
- Boiler Installation (BL)
- Boring & Tunneling (BT)
- Bridges (BR)
- Building (BD / LB / UB)
- Concrete (CT)
- Concrete Paving (CP)
- Glass & Glazing (GG)
- Grading (GD)
- Highway (HY)
- Highway Incidental (HI)
- Nonstructural Renovation (NR)
- Marine (MR)
- Masonry (MS)
- Miscellaneous Metals (MM)
- Pipelines (PL)
- Pre-Engineered Metal Buildings (MB)
- Public Electrical Utility (1U / 2U)
- Railroad (RR)
- Roofing (RF)
- Structural Framing (SF)
- Swimming Pools (SP)
- Water & Sewer Lines (WL)
- Water & Sewer Plants (WP)
- Wood Frame Structures (WF)
Building (BD/LB/UB) includes MS, MM, NR, MB, RF, SF, and WF. LB = limited to 3 stories; UB = no height limit. :contentReference[oaicite:1]{index=1}

